Magnetic–Mineralogical Anomalies at the Pleistocene–Holocene Boundary in Lacustrine Sediments of Northeastern Russia

The results of study of lacustrine sediments of Northeastern Russia are presented. The reasons for the extremely high values of magnetic susceptibility are considered for the transitional Late Pleistocene to Holocene beds. The magnetic fraction of sediments of Grand Lake includes detrital titanomagnetite and magnetite. The high values of magnetic susceptibility of sediments of Gryazevoe, Sosednee, Vodorazdel’noe, and Sapog lakes are caused by the presence of authigenic Fe sulfides, mostly, greigite. Our data contradict the well-known suggestion on the presence of an impact event at the Pleistocene–Holocene boundary.